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5 Application guidelines
Installer reference guide
22
ERHQ+ERLQ011~016 + 16CBV
Daikin Altherma – Low temperature split
4P449970-1 – 2016.06
The power or current of the entire Daikin system is limited
dynamically by digital inputs (maximum four steps). Each power
limitation level is set via the user interface by limiting one of the
following:
▪ Current (in A)
▪ Power input (in kW)
The energy management system (field supply) decides the activation
of a certain power limitation level.
Example:
To limit the maximum
power of the entire house (lighting, domestic appliances, space
heating…).
a
b
A
B
C
D
1
2
3
4
5
A8P
A
Outdoor unit
B
Indoor unit
C
DHW tank
D
Energy management system
a
Power limitation activation (4 digital inputs)
b
Anti-legionella heater
P
i
t
DI4
DI3
DI1
a
b
P
i
Power input
t
Time
DI
Digital inputs (power limitation levels)
a
Power limitation active
b
Actual power input
Setup
▪ Demand PCB (option EKRP1AHTA) needed.
▪ Maximum four digital inputs are used to activate the
corresponding power limitation level:
▪ DI1 = weakest limitation (highest energy consumption)
▪ DI4 = strongest limitation (lowest energy consumption)
▪ For the specifications of the digital inputs, and for where to
connect them, refer to the wiring diagram.
Configuration
Set the power consumption control settings in [A.6.3.1] via the user
interface (for the description of all settings, see
"8 Configuration" on
page 50
):
▪ Select activation by digital inputs.
▪ Select the type of limitation (power in kW or current in A).
▪ Set the desired power limitation level corresponding to each digital
input.
INFORMATION
In case more than 1 digital input is closed (at the same
time), the digital input priority is fixed: DI4 priority>…>DI1.
5.6.3
Power limitation process
The outdoor unit has better efficiency than the electrical heaters.
Therefore, the electrical heaters are limited and turned OFF first.
The system limits power consumption in the following order:
1
Limits certain electrical heaters.
If… has priority
Then set the heater priority
via the user interface to…
Domestic hot water production Anti-legionella heater.
Result:
The backup heater (if
applicable) will be turned OFF
first.
Space heating
Backup heater (if applicable).
Result:
The anti-legionella
heater will be turned OFF first.
2
Turns OFF all electrical heaters.
3
Limits the outdoor unit.
4
Turns OFF the outdoor unit.
Example
If the configuration is as follows:
▪ Power limitation level does NOT allow operation of both anti-
legionella heater and backup heater (step 1 and step 2).
▪ Heater priority = Anti-legionella heater.
Then power consumption is limited as follows:
P
h
C
e
a
b
c
d
e
A
B
C
P
h
Produced heat
C
e
Consumed energy
A
Outdoor unit
B
Anti-legionella heater
C
Backup heater
a
Limited outdoor unit operation
b
Full outdoor unit operation
c
Anti-legionella heater turned ON
d
Backup heater step 1 turned ON
e
Backup heater step 2 turned ON
5.7
Setting up an external temperature
sensor
You can connect one external temperature sensor. It can measure
the indoor or outdoor ambient temperature. Daikin recommends to
use an external temperature sensor in the following cases:
Indoor ambient temperature
▪ In room thermostat control, the user interface is used as room
thermostat and it measures the indoor ambient temperature.
Therefore, the user interface must be installed on a location:
▪ Where the average temperature in the room can be detected
▪ That is NOT exposed to direct sunlight
▪ That is NOT near a heat source
▪ That is NOT affected by outside air or air draught because of,
for example, door opening/closing
▪ If this is NOT possible, Daikin recommends to connect a remote
indoor sensor (option KRCS01-1).
▪ Setup: For installation instructions, see the installation manual of
the remote indoor sensor.